NAME
atol atoll
— convert a string to a long integer
SYNOPSIS
#include
<stdlib.h>
long atol(const char *nptr); long long atoll(const char *nptr);
DESCRIPTION
[CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.
Except as noted below, the call atol (
nptr) shall be equivalent to:
strtol(nptr, (char **)NULL, 10)
Except as noted below, the call to atoll ( nptr) shall be equivalent to:
strtoll(nptr, (char **)NULL, 10)
The handling of errors may differ. If the value cannot be represented, the behavior is undefined.
RETURN VALUE
These functions shall return the converted value if the value can be represented.
ERRORS
No errors are defined.
EXAMPLES
None.
APPLICATION USAGE
If the number is not known to be in range,
strtol(3) or strtoll(3) should be used
because atol () and atoll () are
not required to perform any error checking.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
XBD <stdlib.h>
CHANGE HISTORY
First released in Issue 1. Derived from Issue 1 of the SVID.
Issue 6
The atoll () function is added for alignment with the ISO/IEC 9899:1999 (“ISO C99”) standard.
Issue 7
SD5-XSH-ERN-61 is applied, correcting the DESCRIPTION of atoll ().
POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0046 [892] is applied.